Version 0.13.0

Blog post: https://blog.holoviz.org/panel_0.13.0.html

Features

• Add support for scheduling global callbacks (#2661)
• MathJax now supported in Markdown and HTML (#2847)
• Improved support for async (e.g. in ParamMethod/ParamFunction, bind, onload etc.) (#2964, #3264, #2737)
• Support rendering Panel objects in Jupyterlite and Pyodide (#3252, #3361, #3381)
• Add JSONEditor widget (#1974)
• Add quill.js based TextEditor widget (#2875)
• Add GenericLoginHandler for custom OAuth (#2873, #2960)
• Implement Notifications API for templates (#3093)
• Implement built-in threading (#2597, #2632, #3081)
• Implement profiling page for Panel (#2645, #2664, #2667, #2707, #2905)
• Implement support for Vega events (#2592)
• Implement ArrayInput widget (#2047)
• Add Debugger widget (#2548)
• Add LinearGauge indicator (#3222)
• Add ComponentResourceHandler to server (#3284, #3289, #3303)

Enhancements

Components

• Editable sliders name can be changed (#2678)
• Make Plotly pane resize when window resizes (#2704)
• Viewer objects can now be used with pn.serve (#2769)
• VTK improvement for NaN handling (#2826)
• Add support for configuring Vega output (#2846)
• Add a groups parameter to Select widget (#2876)
• Add Card.hide_header option (#2947)
• Support bytes and pathlib.Path objects on Image (#2963, #3294)
• Add programmatic control over Player widget (#2970, #2994)
• Add alphabetical and custom sort to Param (#2986)
• Add autoplay and muted to Audio and Video (#3053)
• Add a disabled_options parameter to a custom Select widget (#3067)
• Expose the orientation parameter of the button group widgets (#3083)
• Add support for rendering pandas styler objects (#3152)
• Viewer now better at working with depends functions (#3159)
• Improve support for jinja2 loops in ReactiveHTML (#3236)
• Add ability to require explicit load of ReactiveHTML extension (#3254)
• Improve datetime handling of sliders (#3276)
• Add support for multiple files in FileInput.save (#3300)
• Add improved Tabs model that resolves sizing and hover issues (#3301, #3321, #3329)

Tabulator

• Add support to expand rows in Tabulator (#2762, #2837, #3010, #3163)
• Implement client-side filtering on Tabulator (#2815, #3298)
• Add Tabulator.header_align parameter (#2861)
• Implement Tabulator.on_edit callbacks (#2887, #3209, #2958)
• Implement DateEditor and DatetimeEditor for Tabulator (#2899, #3008)
• Implement Tabulator.buttons (#3111)
• Redesign Tabulator.styles handling (#3175)
• Set default alignment for Tabulator (#3194)
• Bidirectionally sync Tabulator.sorters (#3217)
• Add support for setting percentage widths on Tabulator columns (#3239)
• Add Tabulator.on_click callback (#3245)
• Restore Tabulator scroll position after patch (#3273)
• Enable max row limits for Tabulator (#3306)

Notebook

• Add basic JupyterLab theme support (#2848)
• Support jupyter server root_dir with lab extension (#3172)
• Avoid multiple extension execution in the notebook (#3266)
• Added fullpath to jupyter_server_extension (#3270)

General improvements

• Warn users if extension is not loaded before server page is rendered (#2766)
• Sync URL location hash interactively (#2982)
• Change accent and header background color for Fast Templates (#2984)
• Add thread safety and TTL to pn.state.as_cached (#3198)
• Add py.typed file to support mypy (#3055)
• Handle authentification errors (#3096)
• Support saving png to file-like objects (#3155)
• Check if there are any query parameters in baseurl and adds it to location.search if possible (#3214)
• Improve handling of --index CLI argument (#3221)
• Fix event dispatch (#3231)
• Add azure oauth v2.0 endpoint support (#3224)
• Ensure gc.collect is not excessively called (#3259)
• Added panel.reactive and panel.viewable to namespace (#3157)
• Consistent handling of page title (#3290)

Bugs

Components

• Fix warnings in ReactiveHTML regex (#2786)
• Fixed UTF-8 decoding in Terminal widget (#2880)
• Allow a param.Selector with no objects to be casted to AutocompleteInput (#2966)
• Update ButtonGroup value when changing options (#2999)
• Fix TQDM style color reset (#3040)
• Fix align-items on Flexbox (#3122)
• Fix issue serializing Spinner with negative value (#3154)
• Fixes for jslinking HoloViews components (#3165)
• BooleanStatus and LoadingSpinner now update when changing color (#3191)
• Fix Widget.from_param when precedence is negative (#3199)
• Ensure DiscreteSlider label is updated (#3278)
• Ensure ReactiveHTML template variables only escapes exact matches (#3279)
• Fix handling of single and empty options on DiscreteSlider (#3297)
• Ensure Progress correctly initializes as indeterminate (#3307)
• Always resolve DOM nodes in ReactiveHTML._scripts ([#3311](https://githu...

Version 0.12.7

The 0.12.7 release primarily fixes an incompatibility with the new jinja2 3.1.0 release. Many thanks to @maartenbreddels, @govinda18, @raybellwaves and the maintainers @maximlt and @philippjfr for contributing further fixes to this release.

Bug fixes:

• Wrong offset when memoryview format is non-byte (#3206)
• Support jupyter server root_dir with lab extension (#3172)

Docs:

• add note on enabling panel widget on Jupyter Lab (#3029)
• Remove redundant and confusing JupyterLab install instructions (#3037)

Compatibility:

• Fix jinja2 imports (#3258)

Version 0.12.6

The 0.12.6 release fixes a major regression introduced in the last release along with a small number of pre-existing bugs.

Regressions:

• Always load imported bokeh extensions (#2957)
• Fix regression rendering HoloViews plotly backend (#2961)

Bug fixes:

• Do not run Ace import on initialization (#2959)
• Improve handling of ReactiveHTML cleanup (#2974, #2993)
• Ensure empty Str has same height as non-empty (#2981)
• Ensure Tabulator supports grouping on numeric columns (#2987)
• Fix Tabulator with multi-index and pagination (#2989)
• Allow index as column name in table widgets (#2990)
• Ensure TemplateActions component does not have height (#2997)

Version 0.12.5

The 0.12.5 release contains a larger number of bug fixes and minor enhancements. Many thanks to @pmav99, @samuelyeewl, @xavArtley, @L8Y, @Prashant0kgp, @t-houssian, @kristw, @jlstevens and the maintainers @maximlt, @MarcSkovMadsen and @philippjfr for their contributions to this release.

Compatibility:

• Ensure ipywidget rendering is compatible with ipykernel>6 and bokeh>2.4 (#2798)
• Build panel.js against bokeh.js 2.4.2 (#2945)

Enhancements:

• Add 'light' to list of button types ([#2814, #2816)
• Make OAuth cookie expiry configurable (#2724)
• Run onload callbacks with --warm option (#2844)
• Improve Plotly responsive sizing behavior (#2838)
• Adds escape parameter to DataFrame pane to enable using html markup (#2893)
• Allow to update the completions options from a parameter (#2895)
• Tabs cache dynamic contents (#2909)
• Allow setting a maximum height for the loading indicator (#2910)
• Ensure loading of MathJax bundle is optional (#2919)

Bug fixes:

• Resolve issues with inline resources on save (#2794)
• Restore ability to set a maximum number of selectable rows on Tabulator (#2791)
• Fixed bug where Tabulator with remote pagination would modify the wrong rows (#2801)
• Ensure non-exported requirejs modules do not error (#2808)
• Ensure Tabulator checkbox selection only happens in checkbox column (#2812)
• Vtkvolume correction of dimensions order (#2818)
• Allow data item to miss optional field in Vega pane (#2853)
• Allow to set AutoCompleteInput in a Param pane (#2874)
• Fix Terminal keystroke and size handling (#2878)
• Fix Tabulator styles on scroll (#2881)
• Do not sync Indicator properties from frontend to avoid errors (#2886)
• Fix roundtrip of datetimes on ReactiveData components (#2888)
• Fix handling of Plotly pane in Tabs (#2890)
• Fix bokeh colorbar background for dark theme (#2897)
• Fix issues when streaming or patching ReactiveData (#2900)
• Ensure stream and patch events do not boomerang (#2902)
• Fixes for Card rendering in MaterialTemplate (#2911, #2912)
• Ensure HoloViews matplotlib output uses tight layout (#2920)
• Fix decoding of single quoted strings in url parameters (#2925)
• Fix Tabulator checkbox selection (#2931)
• Fix Vega pane sizing issues (#2933)
• Ensure toggled Accordion only triggers one event on change of active Card (#2934)
• Ensure LiteralInput JS deserializer does not insert extra spaces (#2935)
• Fix issue in detecting script data assignment in ReactiveHTML (#2939)
• Ensure Card collapsible icon offset is computed robustly (#2940)
• Ensure --autoreload does not reload panel modules (#2941)
• Ensure pn.state.curdoc is available to async callbacks (#2942)

Documentation:

• Fix default values of panels.io.server.serve()(#2799)
• Update docs about pn.serve per user state (#2849)
• Added FastApi in the user guide for embedding apps (#2870)
• Simplify homepage (#2850)

CVEs:

• Update jQuery to remediate CVEs (#2885)

Version 0.12.4

The 0.12.4 release fixes a number of bugs and a regression of the autoreload feature in 0.12.2 and 0.12.3.

Compatibility:

• Fix issues with --autoreload caused by changes in Bokeh 2.4 (#2755)

Enhancements:

• Ensure user is warned if an extension was not loaded in time on server (#2765)
• Allow Viewer classes to be served (#2768)
• Add support for rendering .ico files and pathlib objects (#2757)

Bug fixes:

• Fixed export of vtk.js module (#2562)
• Fix broken HTMLTemplateFormatter on Tabulator (#2730)
• Fix serialization issues of Panel components on ReactiveHTML (#2743)
• Ensure FlexBox behaves like a layout and makes its children discoverable (#2779)
• Ensure Plotly plots can be updated in tabs (#2747)
• Fix embedding of Panel apps in Flask (#2727)
• Ensure Spinner widget honors bounds when created from Param object (#2740)
• Ensure Tabulator style does not disappear after resize event (#2770)
• Fix PeriodicCallback errors (#2764)
• Fix syncing of boolean types with URL parameters (#2758)
• Ensure Tabulator.download_menu applies kwargs to the filename TextInput (#2763)
• Ensure Tabulator does not error when no Styler is defined (#2785)

Documentation:

• Fix MaterialUI custom component example (#2680)
• Fix image url in Markdown reference gallery example (#2734)
• Add Folium thumbnail in reference gallery (#2744)

Version 0.12.3

The 0.12.2 release unfortunately has a compatibility issue with Bokeh 2.4 which broke the show() method. This release fixes this regression.

• Patch Bokeh to fix show() (#2748)

Version 0.12.2

This is a patch release with a small number of bug fixes and compatibility for bokeh 2.4. Many thanks to the contributors @Stubatiger, @maximlt, @nghenzi and the maintainers @MarcSkovMadsen and @philippjfr for the fixes in this release.

Enhancements:

• Add option to hide constant parameters on Param pane (#2637)
• Added on_session_destroyed callback (#2659)
• Stricter validation for linking syntax in ReactiveHTML._template (#2689)

Bug fixes:

• Improved thread safety (#2631)
• Ensure sessions get distinct files in config (#2646)
• Fix bug when updating Trend data (#2647)
• Ensure sorters are applied correctly after updating Tabulator value (#2639)
• Correctly reflect filtered data on Tabulator.selection (#2676
• Unescape child literal HTML in ReactiveHTML (#2690)
• Ensure Trend indicator can be rendered in layout (#2694)

Documentation:

• Enhance templates docs (#2658)
• Add Folium reference notebook (#2672)

Compatibility:

• Add support for bokeh 2.4 (#2644, #2687, #2696)

Version 0.12.1

This is a patch release with a small number of fixes following the 0.12.0 release. Many thanks to the maintainers @MarcSkovMadsen and @philippjfr for the fixes in this release.

Enhancements:

• Bundle .map files during build to allow source mapping (#2591)
• Various style improvements for Fast templates (#2604, #2609, #2611, #2615)
• Implement hierarchical aggregation for Tabulator (#2624)

Bug fixes:

• Fix logo on Fast templates (#2184)
• Fix height responsiveness of Folium pane (#2231)
• Fix bug updating Tqdm indicator (#2554)
• Ensure --autoreload doesn't error on cleaned up session (#2570)
• Don't use persisted layout if save_layout=False (#2579)
• Pin version of tqdm with asyncio support (#2595)
• Reset layout when resetting grid template layout (#2576)
• Fix line-height issues in Fast templates (#2600)
• Clean up sessions after warmup and ensure periodic callbacks are cleaned up (#2601)

Documentation:

• Enable JupyterLab preview button on binder (#2545)
• Update theme toggle documentation for Fast templates (#2560)
• Update Fast template documentation and enable full screen (#2577)
• Fix binder links on website (#2590)
• Add docs about loading the ipywidgets extension (#2594)

Version 0.12.0

The 0.12.0 release is a minor release with a lot of exciting and a huge amount of bug fixes. We are very excited about the growing community and the many contributions we received. In particular we would like to thank @douglas-raillard-arm, @mathrick, @jlstevens, @hyamanieu, @Liam-Deacon, @Stubatiger, @ablythed, @syamajala, @hoxbro, @jbednar, @brl0, @OBITORASU, @fleming79, dhruvbalwada and @rmorshea for contributing various fixes and improvements and the core developers @xavArtley, @MarcSkovMadsen and @philippjfr for continuing to push the development of Panel.

Features:

• Add ReactiveHTML (#1894, #2091, #2092, #2098, #2115, #2210, #2287, #2290, #2332, #2345, #2372, #2373, #2374, #2383, #2384, #2393, #2397, #2399, #2400, [#2401 #2402, #2404, #2533, #2535)
• Add Terminal Widget based on xterm.js (#2090)
• Adding a DatetimePicker widget (#2107, #2135)
• Add editable sliders (#2111, #2133, #2208)
• Add FlexBox layout (#2233, #2511)
• Add ability to configure global template (#2271)
• Add GridStack layout (#2375)
• Add PDF pane (#2444)
• Add /panel-preview endpoint for Jupyter server extension (#2341, #2361)
• Add Tqdm Indicator (#2079)

Enhancements:

• Add empty Progress bar (#2088)
• Optimize initialization of templates (#2096)
• Serialize Perspective schema (#2130)
• Updated JSON pane to accept single quote and wrap properly (#2143, #2443)
• Improvements for Perspective (#2153)
• Improve handling of server prefix and proxied deployment scenarios (#2159, #2162)
• Add support for setting bokeh theme (#2164, #2166, #2170)
• Completely overhauled the default index template (#2198, #2340)
• Enhancements for Template modals (#2269, #2523)
• Make the Template sidebar width configurable (#2301)
• Improve look and feel and styling of Fast templates (#2303, #2469, #2484, #2488)
• Allow setting kwargs in Reactive.controls (#2304)
• Add global configuration variable to always throttle sliders (#2306)
• Add support for controlling text alignment in DataFrame and Tabulator (#2331)
• Add Tabulator theme for Fast Templates (#2425)
• Add ability to make only certain Tabulator rows selectable (#2433)
• Add visible parameter to all components (#2440)
• Send Plotly restyle and relayout events rather than full updates (#2445)
• Add push_notebook helper function for syncing bokeh property changes in notebooks (#2447)
• Improve visual styling of Card (#2343, #2348, #2376, #2437, #2527)
• Ensure config variables are configured per user session (#2358, #2455, #2481)
• Add save_layout and prevent_collision to ReactTemplate and FastGridTemplate (#2296, #2357)
• Add ability to declare root application from panel serve (#2392)
• Support jslinking Parameterized class (#2441)
• Improve config.sizing_mode behavior (#2442)
• Add separate RangeSlider value_start and value_end parameters (#2457, #2468)
• Allow saving Templates (#2461)
• Bundle Tabulator resources to allow usage in airgapped environment (#2471)
• Ensure Trend indicator title wraps (#2483)
• Scroll on Tabulator selection (#2503)
• Increase notebook resource load timeout (#2515)
• Auto-detect VSCode and Colab comms (#2536)
• Add tooltip to Tabulator cells to see unformatted value (#2543)

Bug fixes:

• Fix missing video in Video (#2109)
• use idom.config to set dist dir (#2117)
• Remove bootstrap CSS from FastGridTemplate (#2123)
• Fix issues with Ace z-index (#2126)
• Fix updating of Tabulator selection property (#2128)
• Ensure changes on ReactiveData source are scheduled correctly (#2134)
• Fixed Player looping when start is 0 (#2141)
• Fix divide by zero issues on Trend indicator (#2148)
• Ensure GridSpec override handles duplicate matches (#2150)
• Fix for loading parameter widget linking (#2160)
• Fix Tabulator ajax call on empty data (#2161)
• Fix Tabulator sorting and data initialization (#2163)
• Fix editing Tabulator with filters applied (#2165)
• Fix theming on HoloViews plot updates (#2209)
• Fixed data handling on Perspective pane (#2212)
• Improve template and resource management for png export (#2221)
• Improve and standardize selection behavior of Tabulator (#2230)
• Ensure JS changes to Plotly pane are applied if not explicitly triggered (#2251)
• Fix server-side Tabulator selection changes (#2252)
• Fix update of Param subobjects (#2255)
• Add support for vtkCornerAnnotations (#2257)
• Improve request handling for remote pagination on Tabulator (#2265)
• Allow setting Param precedence to None (#2266)
• Disable nested field separators on Tabulator (#2289...

Version 0.11.3

The 0.11.3 release is another micro-release in the 0.11 series primarily focused on updating the documentation theme and a regression in loading Tabulator data.

Bug fixes:

• Fix Tabulator sorting and data initialization (#2163)
• Improved handling of IDOM build directory (#2168)
• Fix apply of bokeh_theme in templates (#2170)

Documentation:

• Switch to PyData Sphinx Theme (#2139)